Judging by the scaling of the farm food quests (800 million hams for stage V), that’s a real possibility. I’m not going to be finding out myself anytime soon though, as mid-platinum is my current skill/team power level. Stage III avatar is as high as I’ll likely get without a lot of TC20 luck and time spent levelling.
Hmm, if there are Five tiers (Bronze, Silver, Gold, Platinum, Diamond), and we have Renfeld, Friar Tuck, Domitia…who are we missing? 
it skipped bronze and started at silver.
Hmm, that’s where I’m at…but I didn’t see any auto-awarded icon for Bronze. Pity…
I’m fighting raid mastery III, the gift is domitia avatar for platinum or higher. Do you know Wich are the next avatars?
Raid 4 is Quintus. I can’t get to diamond tier yet, so I have no idea what the Raid V avatar might be, or even be sure that there is one yet.